<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        span {
            display:inline-block;
            height: 150px;
            width: 25%;
        }
        div{
            height: 150px;
        }
    </style>
</head>
<body>
<div>
    <div >头部</div>
    <div >导航</div>
    <div>
        <span>左</span>
        <span style="width: 49%">中</span>
        <span>右</span>
    </div>
    <div>头部</div>
    <div>导航</div>
</div>
</body>
</html>
